Letter from Geo Fras [George Francis] Fitzgerald, Trinity College, Dublin, to [Joseph] Larmor Larmor must wait for criticisms as Fitzgerald had lent his paper to [Frederick Thomas] Trouton and [Thomas] Preston. Fitzgerald has only had time to look over it, but is is not nonsense and he thinks Larmor has made a great advance. It may not be so simple as Larmor suggests, however. Fitzgerald thinks that electric polarisation may be like crystallisation of a hemihedral kind. Such things can be represented very well by a single vector with a rotational and translational aspect. Nevertheless, Larmor has made an advance in calling attention to the applicability of vortex ring analysis to [James] MacCullagh's medium. If Larmor has one to spare, Fitzgerald would like another copy of his British Association paper. He discusses what he thinks is an error of Larmor's on vortex filaments. If Lord Kelvin has illustrated his turbulent liquid by vortex filaments instead of by vortex rings, it would have been very much as Fitzgerald advocates. Kelvin had a Royal Irish Academy paper a year ago, to prove that a complex of straight hollow vortex filaments could stand. [The last part of the letter is currently attached to MS/603/3/44]. 13 December 1893